stillman



Ap 3 T. B. STILLMAN 1,800,669

METALLURGICAL FURNACE PROCES 5 Filed April 22, 1926 2 Sheets-Sheet 2 hi h ffmw A TTORNE VJ Patented Apr. 14, 1931 UNITED STATES PATENT. OFFICE THOMAS B. STILLMAN, OF SOUTH ORANGE, NEW JERSEY, ASSIGNOR TO THE BABCOCK & WILCOX COMPANY, OE BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY METALLURGICAL-FURNACE PROCESS Application filed April '22,

This invention relates to a process of operating metallurgical furnaces and to an atomized fuel burner, especially adapted for this purpose. The invention will be understood from the description in connection with the accompanying drawings, in which Fig. 1 is a longitudinal section through a metallurgical furnace; Fig. 2 is a vertical section on an enlarged scale showing the burner and its connection to'the furnace; Figs. 3 and 4-. are opposite end views of Fig. 2 and Fig. 5 is a section along the line 5--5 of Fig. 4. In the drawings, reference character indicates a metallurgical furnace of a well-known type that is of considerable length inproportion to its width, and is provided with an opening 11 into which the fuel burner, to be described more in detail below, extends. The exit or stack 12 for waste products of combustion leads upwardly from the end of the furnace opposite the fuel burner. Material 13 to be melted or heat treated is shown in the lower part of the furnace and side openings 14 are provided that may be closed by closures 15 operated by chains lfi'extending over guide pulleys 17.

Heretofore, in the operation of metallurgical furnaces of this type in which the heating flame is passed between the material to be treated and the top wall of the furnace, difliculties have been experienced because the material nearest the inlet or fuel burner became meltedlfirst, and a-considerably longer time was required to melt the material in the rear portions of the furnace remote from the fuel burner. By the present invention, this di'flicultyis overcome and .all parts of the material to be melted can be melted at ap- ,24 proximately the same time. The time and amount of fuel required to heat the mass to the desired temperature are also considerably reduced. This result may be accomplished by this invention by providing a flame that is produced by a liquid fuel jet, such as oil, while at the same time, the flame is directed in a proper manner over'the material to be treated. The oil particles that are to be burned for the purpose of producing the heat are caused to travel longitudinally through the furnace and the stream of oil and the 1926. Serial No. 103,739.

delayed until the oil has progressed a-cons'iderable distance into the furnace, instead of all of it being burned near the entry end of 'the furnace.

The oil burner for producing this result is shown in detail in Figs. 2 to 5 of the drawings, in which reference character indicates a mechanical atomizer from which oil under pressure is delivered in the form of a cone of spray, the atomizer nozzle being arranged sothat acone with a relatively small angle, say 30, is formed. The atomizer 20 is mounted in a holder 21 that is provided with a thumb screw 22 to retain the atomizer 20 in place. The holder 21 is provided with an external ring or disc 23, whose edge is rounded slightly so that the disc or ring forms a segment of a sphere. A plate 24 having strengthening ribs 24 is fastened by means of the bolts 25 to a casing 26 that is mounted in I front of the opening 11 of the furnace. The plate 24 is provided with an opening 28 having a flange 29 around its edges, and a cover 30 having a similar 0 ening 31 with a flange 32 around its edge is astened b means of the wing nuts 33 to the plate 24, thus providing a seat in the shape of a segment of a sphere, and of sufficient size to accommodate the ring 23 of the holder2l and permit the same to be turned into different positions in said seat, so as to enable the holder 21 and the atomizer 20 to be directed in different directions. In other words, a universal joint is-provided between the holder 21 and the seat in the plate The plate 24.- is also provided with an inspection door 34.

The casin i front of the opening 11 is provided at its top with a damper 35 that is pivoted in the si e walls of the casing, as shown at 36. A handle 37 for the damper 35 projects through the front wall of the casing and a rod 38 fastened to the front wall of the casing enables the damper to be clamped in ad usted positions by means of .the clamp 39 that embraces the rod 38 and the handle 37 A damper 40 similar to the damper 35 is P 1931- F. M. VENZIE PLASTER BOARD STRUCTURE AND CLIP THEREFOR I I I I I I I I I I I Filed March 22, 1950 ATTGRNEY 

